code: def testRegression(self):
      signal = (
          numpy.sin(
              numpy.arange(1024, dtype="f4")
              / 1024.0
              * 441
              * 2
              * math.pi
          )
          + 1j
          * numpy.cos(
              numpy.arange(1024, dtype="f4")
              / 1024.0
              * 441
              * 2
              * math.pi
          )
      ).astype(numpy.complex64)
      self.assertAlmostEqualVector(
          signal, IFFTC()(FFTC(negativeFrequencies=True)(signal)), 1e-2
      )
  
file_path: essentia/test/src/unittests/standard/test_ifftc.py
imports: from essentia_test import *
  import math
label_desc: Use image node_id 5 for calling the TestIFFT obj's underlying member method code with example usage: obj.testRegression() without return types